Tbh I think the issue of 'Undercovers' is too overrated in PTP.
Most undercovers have literally shit naming sense and deducing them out is too easy. Which in case the can be reported in case of foul play and they can get punished.
I mostly go undercover from time to time to record rulebreakers for evidence but ironically only catch them on my main account lel.
I honestly don't get how one can 'Statswhore' while being an undercover because they could only affect another players' Kills/Deaths Ratio by being a Inferior or Superior respectively. They don't get the K/Ds on their main account.
The only thing I see is harassing other players by either:
TeamKilling/TeamBlocking: In which case /r can be used and IP/Location/etc can be dealt with and the UC Player being punished in case.
Affecting other Player's Deaths and not getting their main KD ratio being affected: This should be taken as a compliment lol, the player is literally forced to make another account just to mess with you. One is literally exposing their own weakness infront of the opposing player in public. You can continue stomping that one individual or simply ignore that player's pettiness and play the Gamemode like usual giving the UC the ultimate L.